[R] how to replace the second "-"

Marc Schwartz
Fri, 20 Oct 2006 04:06:09 -0000

Just another possibility:

> sub("-([0-9])$", "0\\1", c("1-1-1",
"1-1-2", "1-2-1"))
[1] "1-101" "1-102" "1-201"

Regards,

Marc Schwartz

On Thu, 2006-10-19 at 23:38 -0400, Gabor Grothendieck
wrote:
> Try this:
>
> sub("(-[^-]*)-", "\\10", c("1-1-1",
"1-1-2", "1-2-1"))
>
>
> On 10/19/06, ronggui <ronggui.huang at gmail.com> wrote:
> > I have a string vector like these:
> > [1] "1-1-1" "1-1-2" "1-2-1"
> >
> > And I wanna replace the second "-" with "0", that
is, I wanna get the result
> > like: [1] "1-101" "1-102" "1-201".
> >
> > How should I write the Regular Expressions? Thanks!
> >
> > --
> > ??????
> > Department of Sociology
> > Fudan University
> >
> >        [[alternative HTML version deleted]]
> >
> >
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.